A law enforcement source, who spoke on the condition of anonymity because the case was ongoing, said investigators allege Salas made contact with the student both on the Internet and in person with the intent of committing a sexual offense.

"Salas is currently being held on suspicion of violating section 288.3 of the California Penal Code: contact with minor with intent to commit a sexual offense. Salas is being held at the Los Angeles Inmate Reception Center in downtown Los Angeles and is expected to be in state court tomorrow," the FBI said in a statement.

Salas worked as a girls' volleyball coach. Los Angeles Unified School District Supt. John Deasy early Tuesday morning confirmed the arrest of a school employee to broadcast reporters.

"We have well over 100,000 full-time and part-time employees," Deasy told KTLA-TV. "They drive buses, they prepare food, they teach, they lead. Some people will make bad choices, and when we know about that, we respond to it."